wm.c

   1 /*
   2  * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
   3  * See LICENSE file for license details.
   4  */
   5
   6 #include <stdarg.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9
  10 #include <X11/cursorfont.h>
  11 #include <X11/Xatom.h>
  12 #include <X11/Xproto.h>
  13
  14 #include "wm.h"
  15
  16 /********** CUSTOMIZE **********/
  17
  18 char *tags[TLast] = {
  19         [Tscratch] = "scratch",
  20         [Tdev] = "dev",
  21         [Tirc] = "irc",
  22         [Twww] = "www",
  23         [Twork] = "work",
  24 };
  25
  26 /********** CUSTOMIZE **********/
  27
  28 /* X structs */
  29 Display *dpy;
  30 Window root, barwin;
  31 Atom wm_atom[WMLast], net_atom[NetLast];
  32 Cursor cursor[CurLast];
  33 Bool running = True;
  34 Bool issel;
  35
  36 char stext[1024];
  37 int tsel = Tdev; /* default tag */
  38 int screen, sx, sy, sw, sh, th;
  39
  40 Brush brush = {0};
  41 Client *clients = NULL;
  42 Client *stack = NULL;
  43
  44 static Bool other_wm_running;
  45 static const char version[] =
  46         "gridwm - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
  47 static int (*x_error_handler) (Display *, XErrorEvent *);
  48
  49 static void
  50 usage() {       error("usage: gridwm [-v]\n"); }
  51
  52 static void
  53 scan_wins()
  54 {
  55         unsigned int i, num;
  56         Window *wins;
  57         XWindowAttributes wa;
  58         Window d1, d2;
  59
  60         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  61                 for(i = 0; i < num; i++) {
  62                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  63                                 continue;
  64                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  65                                 continue;
  66                         if(wa.map_state == IsViewable)
  67                                 manage(wins[i], &wa);
  68                 }
  69         }
  70         if(wins)
  71                 XFree(wins);
  72 }
  73
  74 static int
  75 win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
  76 {
  77         Atom real;
  78         int format;
  79         unsigned long res, extra;
  80         int status;
  81
  82         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  83                         &res, &extra, prop);
  84
  85         if(status != Success || *prop == 0) {
  86                 return 0;
  87         }
  88         if(res == 0) {
  89                 free((void *) *prop);
  90         }
  91         return res;
  92 }
  93
  94 int
  95 win_proto(Window w)
  96 {
  97         unsigned char *protocols;
  98         long res;
  99         int protos = 0;
 100         int i;
 101
 102         res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L, &protocols);
 103         if(res <= 0) {
 104                 return protos;
 105         }
 106         for(i = 0; i < res; i++) {
 107                 if(protocols[i] == wm_atom[WMDelete])
 108                         protos |= WM_PROTOCOL_DELWIN;
 109         }
 110         free((char *) protocols);
 111         return protos;
 112 }
 113
 114 void
 115 send_message(Window w, Atom a, long value)
 116 {
 117         XEvent e;
 118
 119         e.type = ClientMessage;
 120         e.xclient.window = w;
 121         e.xclient.message_type = a;
 122         e.xclient.format = 32;
 123         e.xclient.data.l[0] = value;
 124         e.xclient.data.l[1] = CurrentTime;
 125         XSendEvent(dpy, w, False, NoEventMask, &e);
 126         XFlush(dpy);
 127 }
 128
 129 /*
 130  * There's no way to check accesses to destroyed windows, thus
 131  * those cases are ignored (especially on UnmapNotify's).
 132  * Other types of errors call Xlib's default error handler, which
 133  * calls exit().
 134  */
 135 int
 136 error_handler(Display *dpy, XErrorEvent *error)
 137 {
 138         if(error->error_code == BadWindow
 139                         || (error->request_code == X_SetInputFocus
 140                                 && error->error_code == BadMatch)
 141                         || (error->request_code == X_PolyText8
 142                                 && error->error_code == BadDrawable)
 143                         || (error->request_code == X_PolyFillRectangle
 144                                 && error->error_code == BadDrawable)
 145                         || (error->request_code == X_PolySegment
 146                                 && error->error_code == BadDrawable)
 147                         || (error->request_code == X_ConfigureWindow
 148                                 && error->error_code == BadMatch)
 149                         || (error->request_code == X_GrabKey
 150                                 && error->error_code == BadAccess))
 151                 return 0;
 152         fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
 153                         error->request_code, error->error_code);
 154         return x_error_handler(dpy, error); /* may call exit() */
 155 }
 156
 157 /*
 158  * Startup Error handler to check if another window manager
 159  * is already running.
 160  */
 161 static int
 162 startup_error_handler(Display *dpy, XErrorEvent *error)
 163 {
 164         other_wm_running = True;
 165         return -1;
 166 }
 167
 168 static void
 169 cleanup()
 170 {
 171         while(clients)
 172                 unmanage(clients);
 173         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 174 }
 175
 176 void
 177 run(void *aux)
 178 {
 179         spawn(dpy, aux);
 180 }
 181
 182 void
 183 quit(void *aux)
 184 {
 185         running = False;
 186 }
 187
 188 int
 189 main(int argc, char *argv[])
 190 {
 191         int i;
 192         XSetWindowAttributes wa;
 193         unsigned int mask;
 194         Window w;
 195         XEvent ev;
 196
 197         /* command line args */
 198         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 199                 switch (argv[i][1]) {
 200                 case 'v':
 201                         fprintf(stdout, "%s", version);
 202                         exit(0);
 203                         break;
 204                 default:
 205                         usage();
 206                         break;
 207                 }
 208         }
 209
 210         dpy = XOpenDisplay(0);
 211         if(!dpy)
 212                 error("gridwm: cannot connect X server\n");
 213
 214         screen = DefaultScreen(dpy);
 215         root = RootWindow(dpy, screen);
 216
 217         /* check if another WM is already running */
 218         other_wm_running = False;
 219         XSetErrorHandler(startup_error_handler);
 220         /* this causes an error if some other WM is running */
 221         XSelectInput(dpy, root, SubstructureRedirectMask);
 222         XFlush(dpy);
 223
 224         if(other_wm_running)
 225                 error("gridwm: another window manager is already running\n");
 226
 227         sx = sy = 0;
 228         sw = DisplayWidth(dpy, screen);
 229         sh = DisplayHeight(dpy, screen);
 230         issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 231
 232         XSetErrorHandler(0);
 233         x_error_handler = XSetErrorHandler(error_handler);
 234
 235         /* init atoms */
 236         wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 237         wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 238         net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 239         net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 240
 241         XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
 242                         PropModeReplace, (unsigned char *) net_atom, NetLast);
 243
 244
 245         /* init cursors */
 246         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 247         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 248         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 249
 250         update_keys();
 251
 252         /* style */
 253         loadcolors(dpy, screen, &brush, BGCOLOR, FGCOLOR, BORDERCOLOR);
 254         loadfont(dpy, &brush.font, FONT);
 255
 256         th = texth(&brush.font);
 257
 258         brush.drawable = XCreatePixmap(dpy, root, sw, th, DefaultDepth(dpy, screen));
 259         brush.gc = XCreateGC(dpy, root, 0, 0);
 260
 261         wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
 262                                         | LeaveWindowMask;
 263         wa.cursor = cursor[CurNormal];
 264         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 265
 266         arrange = grid;
 267         scan_wins();
 268
 269         while(running) {
 270                 XNextEvent(dpy, &ev);
 271                 if(handler[ev.type])
 272                         (handler[ev.type])(&ev); /* call handler */
 273         }
 274
 275         cleanup();
 276         XCloseDisplay(dpy);
 277
 278         return 0;
 279 }